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According to Boston.com, an estimated 36 people were taken to nearby hospitals while 50 others received medical treatment at the scene with “minor injuries.” There were no fatalities.

The sheer number of those hospitalized reportedly caused the incident to be dubbed a “Phase 2 Mass Casualty Incident” by officials. Most of those involved were said to be between the ages of 16 and 25, and is it suggested that drugs and alcohol, as well as excessive heat, were responsible for the incident.

Boston EMS Deputy Superintendent told The Boston Herald that many were already under the influence when they arrived at the venue last night.

“Fortunately no one was seriously injured. Mostly underaged kids involved in alcohol and or some illicit drugs,” Bosse stated. “This is a mass casualty incident that greatly impacts our resources, Boston police resources as well as area hospitals.”

Concert promoter Live Nation released an official statement regarding the incident (via ET Online), which suggested most of those who were treated never even entered the venue:

“While this is still a developing situation, based on early reports from the venue it appears the majority of the transports were people outside the venue who were too impaired to be allowed inside the venue and access to the concert. Out of an abundance of caution they were transported for medical evaluation and assistance.”

Meanwhile, Avicii, whose real name is Tim Bergling, took to Twitter to express his regret over the unfortunate situation:

Just hearing the awful news abt tonight. Its a terrible thing, I rly hope everyone is ok! My thoughts go to those affected & their families.